Constant-current transformer



Patented Apr. 16, 1929. l I l UNITED STATES PATENT OFFICE.

' .Inssn B. Giens, or SHARON, PENNSYLVANIA, AssIcNon 'roWnsTINeHoUsn ELECTRIC a MANUFACTURING COMPANY, a CoRronA'rIoN or PENNSYLVANIA.

' CONSTANT-CURRENT TRANSFORMER.

Application led September 16, 1926. Serial No. 135,782.

My invention relates to constant-current the lever 8 having a pivot 9. The coil 4.- is regulators and particularly to the manner connected by links 11 and 12 to the lever 8. of mounting hinged coils therein. A stop 13 is rovided on the lever 8 for One object of my invention l1s to provlole engaging the linh 11 when the coil 4 is above a constant-current regulator com rismg .a its horizontal position, in order to prevent eo hinged coil that shall, regardless oiits posithe link11 from assuming a position directly tion, deliver to the secondary c1rcu1t a con- 1n line W1th the link 12, for a purpose to be stant current with smaller limits of error hereinafter described. l than are found in regulators of the types ln constant-current regulators, as hereto- 1oheretofore constructed. fore constructed, the small counterweight 7, c5

Another object of my invention is to proor some equivalent device, is usedto increase vide a constant-current regulator comprising the current at the full-load position of the a hinged coil that shall have means for conihinged coil, by being oppositely disposed to pensating for differences in the edective the counterweight 6 about the pivot`9. If' so 15 turning moment of the moving parts as used, however, it tends to decrease the cur- 70 the position of the moving coil varies from rent While the hinged coil is approaching its a horizontal plane. top position, as the counterweights 6 and 7 In a constant-current regulating transare then disposed on the same side of the former comprising a hinged coil the force pivot 9. The curve GH Fig. 3 shows a typiof repulsion exerted on the movable coilfby cal performance for such regulator which 75 the lixed coil depends on the density oi the has been adjusted to give the best possible magnetic field between the coils, on thecurcompromise for current adjustment. rent in the coils, and on the angular position By a sultable adjustment of the counterof the hinged coil. The mechanical force Weights 6 and 7, the current delivered by a exerted by the counterweight on the hinged constant-current regulator, as heretofore so coil depends upon the angular position of constructed, may be made to follow a curve its lever arm relative to a horizontal plane. such as MPQ, Fig. 3, instead of the curve The total result of these interacting forces GH. The curve MP@ is obtained With the is that a regulator designed in the customcounterweight 7 having a considerable lever 3o ary manner Will deliver a considerably arm about the pivot 9. This gives a much 85 larger current when its hlnged coll 1s in a better current regulation for heavy loads but horizontal position than when it approaches a poorer current regulation for light loads.

either end of its travel and is at an angle rllhe operation of the regulator on light to the horizontal position. loads may be improved by providing the ln the accompanying drawings, Fig. 1 is stop13for increasing the eective length of 90 a view, partially in elevation and partially the lever arm 8 as it rises, as has been prein section, showing a portion of -a regulaviously described. 'lhis action Will decrease tor embodying my invention when the the external Jforce that tends to lift the hinged coil is above its horizontal position. hinged coil d and, therefore, will cause an 40 Fig. 2 is a similar View showing the increase in the current dow'ing in the coil, as hinged coil below its horizontal position, and a greater magnetic repulsive force'is then re- Fig. 3 is a diagrammatic view showing a quired to separate the coils 2 and 4. rllhe characteristic curve of an ordinary constantregulation curve will then take the shape current regulator and of a constant-current MPN, Fig. 3.

regulator embodying my invention, With di- As the coil 4 turns about its hinge 5, its 100 ferent voltages impressed upon theprimary el'cct-ive lever arm about the pivot 9 varies Winding and with the secondary Winding with the position of the lever 8. Referring short-circuited. Vto Fig. 2, when the coil is in its depressed My invention comprises, in general, a conor full-load position, its effective lever arm stant-current regulator 1 having a fixed priabout the pivot 9 is represented by line 0A 105 mary Winding 2, a core member 3, and and, when the coil is in the horizontal posia movable secondary coil 4 that is hingedly tion, this lever arm is represented by the mounted on the core member 3, as at 5. The arm 0B. Weight of the coil 4 is partially balanced by Referring to Fig. land assuming that the counterweights 6 and 7 that are mounted on stop 13 is not present, the effective lever arm 11o of the coil 4 about the pivot 9 is represented by the line OC. When the stop 13 is present, the effective lever arm is represented by the line OD. The difference CD is secured by the action of the stop 13 in preventing the link 11 from assuming its natural position in alinement with link 13. As the link 1l is forced out of its normal position, its lower end moves outward away from core 3, thereby increasing the distance between the point of application of the force exerted by the link 12 and the pivot 9. rllhe amount of the difference CD may be determined by the length of the link 11.

It is to be observed that the variation in the secondary current of the constant-current regulator embodying my invention, as is shown by the curve MPN, is very much less than the variation in the current of the constant-current regulators .heretofore employed, as is shown by the curve GH.

It will thus be seen that I have provided a constant-current regulator in which a stop member is mounted on the lever arm supporting the hinged coil to distort the natural position of the connecting link mechanism for the purpose of increasing the effective lever arm of the hinged coil when the latter is above its horizontal position. Accordingly, I am able to utilize a regulator having a smaller departure from its rated current than is possibleV Where the link mechanism conecting the leverand the coil is permitted to assume its natural or vertical position.

It is to be understood that my invention may be modified within the spirit and scope of the appended claims.

I claim as my invention:

1. In a constant-current regulator, a stationary coil, a movable coil having a hinge mounting at one point, su porting mechanism comprising a pivote lever` and connecting links, and means for controllin the angular relation between one of the inks and the lever to control the effective length of the lever arm supporting the movable coil.

2. lin a constant-current regulator, a stationary coil, a movable coil having a hinged mounting at one point, supporting mechanism comprising a pivoted lever and connecting links, and means mounted on the lever for controlling the angular relation between one of the links and the lever to control the effective length of the lever arm supporting the movable coil.

ln a constant-current regulator, a stationary coil, a movable coil having a hinged mounting at one point, supportingl mechanism comprising a pivoted lever and connecting links, and a sto member mounted on the lever for controlling the angular relation between the lever and one of the links to control the effective length of the lever arm supporting the movable coil.

4. In a constant-current regulator, a stationary coil, a movable coil having a hinged mounting at one point, supporting mechanism comprising a pivoted lever and connecting links occupying a normal straight-- line position, and a stop member mounted on the lever for moving said connecting links from said position Aunder predetermined conditions, thereby to control the effective length of the lever arm supporting the movable coil.

In testimony whereof, l have hereunto subscribed my name this 4th day of September, 1926.

JESSE B. GlBBS. 

